package com.hdu.hot100.list;

public class lc21 {


    public class ListNode {
        int val;
        ListNode next;

        ListNode() {
        }

        ListNode(int val) {
            this.val = val;
        }

        ListNode(int val, ListNode next) {
            this.val = val;
            this.next = next;
        }
    }

    class Solution {
        public ListNode mergeTwoLists(ListNode list1, ListNode list2) {
            ListNode dummy = new ListNode(-1);
            ListNode cur = dummy;
            while (list1 != null && list2 != null)
            {
                if (list1.val <= list2.val)
                {
                    cur.next = list1;
                    list1 = list1.next;
                }
                else
                {
                    cur.next = list2;
                    list2 = list2.next;
                }
                cur = cur.next;
            }
            if (list1 != null) cur.next = list1;
            if (list2 != null) cur.next = list2;
            return dummy.next;
        }
    }
}
